How does my dyno graph look?
Thread Starter
Former Vendor
Joined: Nov 2000
Posts: 5,607
Likes: 1
From: Houston TX
How does my dyno graph look?
How does my dyno graph look? This is after the Donalson Blackwing, Corsa Indy and MAF screen removed. The engine pinged at around 5700RPM, it also did the same thing at the exact RPM during my first baseline dyno.
I doubt that it is because of bad gas because the engine never pinged, at or pass 5700RPM during driving on the street. I'll get some octane booster at the next dyno and see.
I doubt that it is because of bad gas because the engine never pinged, at or pass 5700RPM during driving on the street. I'll get some octane booster at the next dyno and see.
Drifting
Joined: Oct 1999
Posts: 1,272
Likes: 0
From: Gaithersburg MD
Cruise-In II Veteran
Cruise-In III Veteran
Re: How does my dyno graph look? (leanhtuan)
The drop off of power at around 5700 RPM is very common on stock heads & cam LS1's. Even the dyno graphs comparing the LS1 & LS6 on the Corvette Museum website show this drop for the LS1.
I admit that yours is more dramatic than most I have seen.
At the last Dyno session I attended, I mentioned this to the dyno operator and he said every LS1 he has dyno'ed (F-Body and Corvette) has shown the same drop off unless it had a heads & cam package and computer tuning.
So, while normal, why does it do it?
I admit that yours is more dramatic than most I have seen.
At the last Dyno session I attended, I mentioned this to the dyno operator and he said every LS1 he has dyno'ed (F-Body and Corvette) has shown the same drop off unless it had a heads & cam package and computer tuning.
So, while normal, why does it do it?
Race Director
Joined: Aug 1999
Posts: 15,466
Likes: 0
From: GARDENA Ca, State Of Konfusion
St. Jude Donor '05
Re: How does my dyno graph look? (leanhtuan)
My first dyno had a jagged curve similar to your, replaced my stock plugs with TR-55. Cleared it right up, nice a smooth, give it a try!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Thread Starter
Former Vendor
Joined: Nov 2000
Posts: 5,607
Likes: 1
From: Houston TX
Re: How does my dyno graph look? (2thDr)
So were the headers on, or off?
Thread Starter
Former Vendor
Joined: Nov 2000
Posts: 5,607
Likes: 1
From: Houston TX
Re: How does my dyno graph look? (wallstAL)
My first dyno had a jagged curve similar to your, replaced my stock plugs with TR-55. Cleared it right up, nice a smooth, give it a try!
Thanks for the suggestion.
Melting Slicks
Joined: Mar 2001
Posts: 2,809
Likes: 0
From: Frisco TX
Re: How does my dyno graph look? (leanhtuan)
How does my dyno graph look?
I agree with Al, try some NGKs in there to try and clean that puppy up!
:cheers:
BP
Safety Car
Joined: Feb 2000
Posts: 3,635
Likes: 0
From: houston Texas
Re: How does my dyno graph look? (bparker)
How does my dyno graph look?
Looks like one BAD A.Z.Z. Roller Coaster Ride! :lol:
I agree with Al, try some NGKs in there to try and clean that puppy up!
:cheers:
BP
Looks like one BAD A.Z.Z. Roller Coaster Ride! :lol:
I agree with Al, try some NGKs in there to try and clean that puppy up!
:cheers:
BP
Thread Starter
Former Vendor
Joined: Nov 2000
Posts: 5,607
Likes: 1
From: Houston TX
Re: How does my dyno graph look? (Nilla Ice)
I agree change the plugs first...then autotap to see what's up. I have a hook up with ATap, so let me know if you need help.
I'll try that at the next group dyno and let you know.
Thread Starter
Former Vendor
Joined: Nov 2000
Posts: 5,607
Likes: 1
From: Houston TX
Re: How does my dyno graph look? (rschiltz)
What kind of headers are you putting on?
I know that it will definitely be louder at WOT, but anyone knows if it adds any noticeable interior resonance at cruising speed (35-70MPH)?
TIA
-Tuan
Race Director
Joined: Mar 2000
Posts: 17,602
Likes: 20
From: Palm City Florida
Re: How does my dyno graph look? (leanhtuan)
Dude, that graph looks exactly like one from another member who had bent Pushrods. Can't remember his nick.
He changed plug, wires, de carbed etc...
Then finally he had the push rods checked. Bent!
It starts to look clean then all messy and then just falls off.
I don't buy the bad plug idea.
He changed plug, wires, de carbed etc...
Then finally he had the push rods checked. Bent!
It starts to look clean then all messy and then just falls off.
I don't buy the bad plug idea.
Thread Starter
Former Vendor
Joined: Nov 2000
Posts: 5,607
Likes: 1
From: Houston TX
Re: How does my dyno graph look? (chuckster)
Then finally he had the push rods checked. Bent!
It starts to look clean then all messy and then just falls off.
It starts to look clean then all messy and then just falls off.
The dip was already there during the baseline dyno, before the bent pushrods incident. But it wasn't as dramatic as now.
